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From stack <st...@duboce.net>
Subject Re: regionserver disconnection
Date Thu, 12 Nov 2009 19:10:02 GMT
On Thu, Nov 12, 2009 at 10:54 AM, Zhenyu Zhong <zhongresearch@gmail.com>wrote:

> Sorry, there was a typo in my email. But it is 10 minutes that I set in the
> hbase-site.xml.
>
> Please see the link.
> http://pastebin.com/m564c51bc
>
> Very  much appreciated.
> zhenyu
>

And you restarted after making the change?
St.Ack



>
> On Thu, Nov 12, 2009 at 1:42 PM, Jean-Daniel Cryans <jdcryans@apache.org
> >wrote:
>
> > Usually if it was 10 minutes we would see sleepers complaining they
> > slept for way too long. In the logs I can see a 1 minute pause but not
> > 10 minutes because of the ZK debug. Are you sure you don't have a
> > typo? Like what you just wrote is not valid, you wrote
> > zookeeper.session.timout instead of zookeeper.session.timeout. Are you
> > sure it's distributed over the cluster? Could you pastebin
> > hbase-site.xml?
> >
> > Thx,
> >
> > J-D
> >
> > On Thu, Nov 12, 2009 at 10:28 AM, Zhenyu Zhong <zhongresearch@gmail.com>
> > wrote:
> > > J-D,
> > >
> > > Yes, that is weird. But it is what I have in the log. Probably the log
> is
> > > flushed by different threads, and one thread is blocked for a while?
> > >
> > > I set the zookeeper.session.timout=600000, which is 10 minutes.
> However,
> > we
> > > still see this problem.
> > >
> > > Does GC pause for such a long time period?
> > > I will try different GC options to see the differences.
> > >
> > > thanks
> > > zhenyu
> > >
> > >
> > > On Thu, Nov 12, 2009 at 1:10 PM, Jean-Daniel Cryans <
> jdcryans@apache.org
> > >wrote:
> > >
> > >> I see something weird
> > >>
> > >> 2009-11-12 15:04:36,370 WARN
> > >> org.apache.hadoop.hbase.regionserver.HRegionServer: Attempt=1
> > >> org.apache.hadoop.hbase.Leases$LeaseStillHeldException
> > >>        at
> sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> > >> Method)
> > >>        at
> > >>
> >
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> > >>        at
> > >>
> >
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> > >> ...
> > >> 2009-11-12 15:03:52,682 DEBUG org.apache.zookeeper.ClientCnxn: Got
> > >> ping response for sessionid:0x224e55436ad0004 after 0ms
> > >> 2009-11-12 15:04:52,480 WARN org.apache.zookeeper.ClientCnxn:
> > >> Exception closing session 0x24e55436a0007d to
> > >> sun.nio.ch.SelectionKeyImpl@136f6ed1
> > >>
> > >> Goes back in time? I does look better tho. Did you say you set the
> > >> zookeeper session timeout higher in a previous thread? I'd be
> > >> interested to see if a higher (2-3 minutes) value would solve the
> > >> problem until java 7.
> > >>
> > >> The only thing that happens after that LeaseStillHeldException is that
> > >> for some reason (probably GC) the region server paused. This caused
> > >> the session to timeout and should be why the RS isn't connected to the
> > >> ZK quorum member.
> > >>
> > >> BTW we worked with the Zookeeper dev team to have more meaningful
> > >> exceptions and it's already committed in their trunk.
> > >>
> > >> J-D
> > >>
> > >> On Thu, Nov 12, 2009 at 8:40 AM, Zhenyu Zhong <
> zhongresearch@gmail.com>
> > >> wrote:
> > >> > Follow up on the regionserver disconnection:
> > >> >
> > >> > I made a few changes to the cluster setup.
> > >> > 1. split the regionserver and zookeeper quorum servers, such that
> > HRegion
> > >> > doesn't run on the same box as HQuorumPeer. I assume that there
> should
> > be
> > >> no
> > >> > disk io contention between the regionserver and zookeeper.
> > >> >    Now we have 14 regionservers, and 5 zookeeper quorum servers.
> > >> >
> > >> > Though I experienced 2 regionserver disconnection this morning, it
> > looks
> > >> > better from the regionserver log. (please see the following log)
> > >> >
> > >> >
> > >> > http://pastebin.com/m496dbfae
> > >> >
> > >> >
> > >> > I checked diskIO for one of the regionserver(192.168.100.116) during
> > the
> > >> > time it disconnected.
> > >> >
> > >> > Time: 03:04:58 AM
> > >> > Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read
> Blk_wrtn
> > >> > sda             105.31      5458.83     19503.64 9043873239
> > 32312473676
> > >> > sda1              2.90         6.64        99.25   10993934
>  164433464
> > >> > sda2              1.72        23.76        30.25   39365817
> 50124008
> > >> > sda3              0.30         0.38         3.58     624930
>  5923000
> > >> > sda4            100.39      5428.06     19370.56 8992888270
> > 32091993204
> > >> >
> > >> >
> > >> > I also checked the zookeeper quorum server that the regionserver
> tried
> > to
> > >> > connect according to the log. However, I don't see 192.168.100.116
> in
> > the
> > >> > client list of the zookeeper quorum server that the regionserver
> tried
> > to
> > >> > connect.
> > >> > Would that be a problem?
> > >> >
> > >> > Thu Nov 12 15:04:52 UTC 2009
> > >> > Zookeeper version: 3.2.1-808558, built on 08/27/2009 18:48 GMT
> > >> > Clients:
> > >> >  /192.168.100.127:43045[1](queued=0,recved=26,sent=0)
> > >> >  /192.168.100.131:39091[1](queued=0,recved=964,sent=0)
> > >> >  /192.168.100.124:35961[1](queued=0,recved=3266,sent=0)
> > >> >  /192.168.100.123:47935[1](queued=0,recved=233,sent=0)
> > >> >  /192.168.100.125:46931[1](queued=0,recved=2,sent=0)
> > >> >  /192.168.100.118:54924[1](queued=0,recved=295,sent=0)
> > >> >  /192.168.100.118:41390[1](queued=0,recved=2290,sent=0)
> > >> >  /192.168.100.136:42243[1](queued=0,recved=0,sent=0)
> > >> >
> > >> > Latency min/avg/max: 0/17/6333
> > >> > Received: 47111
> > >> > Sent: 0
> > >> > Outstanding: 0
> > >> > Zxid: 0x77000083f4
> > >> > Mode: leader
> > >> > Node count: 23
> > >> >
> > >> > Best,
> > >> > zhenyu
> > >> >
> > >> >
> > >> > On Wed, Nov 11, 2009 at 3:58 PM, Zhenyu Zhong <
> > zhongresearch@gmail.com
> > >> >wrote:
> > >> >
> > >> >> Stack
> > >> >>
> > >> >> I am very appreciated for your comments.
> > >> >> I will use the zookeeper monitoring script on my cluster and let it
> > run
> > >> >> overnight to see the result.
> > >> >> I will follow up the thread when I get anything.
> > >> >>
> > >> >> thanks
> > >> >> zhenyu
> > >> >>
> > >> >>
> > >> >> On Wed, Nov 11, 2009 at 3:52 PM, stack <stack@duboce.net> wrote:
> > >> >>
> > >> >>> I see these in your log too:
> > >> >>>
> > >> >>>
> > >> >>>   1. 2009-11-11 04:27:19,018 DEBUG
> org.apache.zookeeper.ClientCnxn:
> > Got
> > >> >>>   ping response for sessionid:0x424dfd908c50009 after 4544ms
> > >> >>>   2. 2009-11-11 04:27:19,018 DEBUG
> org.apache.zookeeper.ClientCnxn:
> > Got
> > >> >>>   ping response for sessionid:0x24dfd90c810002 after 4548ms
> > >> >>>   3. 2009-11-11 04:27:43,960 DEBUG
> org.apache.zookeeper.ClientCnxn:
> > Got
> > >> >>>   ping response for sessionid:0x424dfd908c50009 after 9030ms
> > >> >>>   4. 2009-11-11 04:27:43,960 DEBUG
> org.apache.zookeeper.ClientCnxn:
> > Got
> > >> >>>   ping response for sessionid:0x24dfd90c810002 after 9030ms
> > >> >>>   5. 2009-11-11 04:27:48,830 DEBUG
> org.apache.zookeeper.ClientCnxn:
> > Got
> > >> >>>   ping response for sessionid:0x424dfd908c50009 after 0ms
> > >> >>>   6. 2009-11-11 04:27:48,830 DEBUG
> org.apache.zookeeper.ClientCnxn:
> > Got
> > >> >>>   ping response for sessionid:0x24dfd90c810002 after 0ms
> > >> >>>
> > >> >>> Which would indicate lag talking to zk too.
> > >> >>>
> > >> >>> Appending HLog also seems to get steadily worse.
> > >> >>>
> > >> >>> I also see these:
> > >> >>>
> > >> >>>
> > >> >>>   1. 2009-11-11 04:27:01,233 WARN org.apache.zookeeper.ClientCnxn:
> > >> >>>    Exception closing session 0x24dfd90c810002 to
> > >> >>>    sun.nio.ch.SelectionKeyImpl@5e16a7e3
> > >> >>>   2. java.io.IOException: Read error rc = -1
> > >> >>>    java.nio.DirectByteBuffer[pos=0 lim=4 cap=4]
> > >> >>>    3.         at
> > >> >>>
> >  org.apache.zookeeper.ClientCnxn$SendThread.doIO(ClientCnxn.java:701)
> > >> >>>   4.         at
> > >> >>>
> >  org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:945)
> > >> >>>
> > >> >>>
> > >> >>> Were all 5 quorum members participating?  Check by doing "echo
> > stat|nc
> > >> >>> QUORUM_HOST port" for each member of quorum.... the below might
> > help:
> > >> >>>
> > >> >>> members="1,2,3,4,5"
> > >> >>> while true; do date; for i in $members; do echo $i; echo stat | nc
> > $i
> > >> >>> 2181;
> > >> >>> done; sleep 10; done
> > >> >>>
> > >> >>> We need to improve our zk_dump.  It just reports quorum members...
> > not
> > >> if
> > >> >>> they are actually participating or not.  The above will tell you
> if
> > >> dead
> > >> >>> or
> > >> >>> alive.
> > >> >>>
> > >> >>> Please report back after checking above and following the
> > Jean-Daniel
> > >> >>> prescription.
> > >> >>>
> > >> >>> Thanks,
> > >> >>> St.Ack
> > >> >>>
> > >> >>>
> > >> >>>
> > >> >>> On Wed, Nov 11, 2009 at 12:29 PM, Zhenyu Zhong <
> > >> zhongresearch@gmail.com
> > >> >>> >wrote:
> > >> >>>
> > >> >>> > Thanks a lot for the help.
> > >> >>> >
> > >> >>> > I understand that the change of disk configurations should be
> done
> > >> >>> > progressively such that HDFS can balance and recover from a disk
> > >> going
> > >> >>> > away.
> > >> >>> >
> > >> >>> > The data we are trying to import into HBase is about 200million
> > rows,
> > >> >>> each
> > >> >>> > row is about hundreds of bytes. Basically, we read in a text
> file
> > >> from
> > >> >>> > HDFS,
> > >> >>> > then  for each row in the text file, we fetch data from HBase
> > table,
> > >> we
> > >> >>> > compare the column value and update the latest value back into
> > HBase.
> > >> I
> > >> >>> was
> > >> >>> > suggested to use CheckAndPut.  Anyway this is the common usecase
> > on
> > >> my
> > >> >>> > side.
> > >> >>> >
> > >> >>> >
> > >> >>> > Many thanks
> > >> >>> > zhenyu
> > >> >>> >
> > >> >>> >
> > >> >>> >
> > >> >>> > On Wed, Nov 11, 2009 at 3:03 PM, Jean-Daniel Cryans <
> > >> >>> jdcryans@apache.org
> > >> >>> > >wrote:
> > >> >>> >
> > >> >>> > > 6 disks, 19 machines and you see those kind of issues? I'm
> quite
> > >> >>> > > surprised and I want to learn more about what you trying to
> to.
> > >> >>> > >
> > >> >>> > > But first, if hbase is managing ZK for you then you can change
> > the
> > >> >>> > > value of hbase.zookeeper.property.dataDir so that it points to
> > its
> > >> own
> > >> >>> > > mount. Make sure you also change dfs.data.dir in
> > conf/hdfs-site.xml
> > >> >>> > > (hadoop stuff) so that it stops pointing there (you should
> have
> > 6
> > >> >>> > > values there at the moment if you configured it correctly).
> > Doing
> > >> this
> > >> >>> > > could result in data loss if you do it all at once so do the
> > change
> > >> >>> > > progressively. This also means that you may have to keep a
> > seperate
> > >> >>> > > HDFS configuration for those particular nodes. Please ask more
> > >> >>> > > questions if it's not very clear.
> > >> >>> > >
> > >> >>> > > WRT to dedicating nodes to Zookeeeper, it makes sense only if
> > you
> > >> have
> > >> >>> > > a lot of nodes but in your case, unless there's also CPU
> > >> contention,
> > >> >>> > > you're good with only a dedicated disk.
> > >> >>> > >
> > >> >>> > > Now for what you are trying to do, is this a massive import
> that
> > >> goes
> > >> >>> > > over many hours? How big is each row? I'd love to get a lot of
> > >> details
> > >> >>> > > to help you optimize your cluster for your particular problem.
> > >> >>> > >
> > >> >>> > > Thx,
> > >> >>> > >
> > >> >>> > > J-D
> > >> >>> > >
> > >> >>> > > On Wed, Nov 11, 2009 at 11:51 AM, Zhenyu Zhong <
> > >> >>> zhongresearch@gmail.com>
> > >> >>> > > wrote:
> > >> >>> > > > J-D,
> > >> >>> > > >
> > >> >>> > > > Thanks a lot for the insightful comments.
> > >> >>> > > > We are running 5 zookeeper quorums now. On these 5 quorum
> > >> servers,
> > >> >>> we
> > >> >>> > > also
> > >> >>> > > > run datanode, tasktracker and regionserver.
> > >> >>> > > > Now we have 6 disks per machine.
> > >> >>> > > > If it is the disk IO saturation, is there anyway to
> configure
> > >> >>> zookeeper
> > >> >>> > > to
> > >> >>> > > > write to a seperate disk which is not the same one used by
> > HDFS?
> > >> >>> > > > Or shall we run zookeeper quorums on different nodes other
> > than
> > >> >>> HDFS?
> > >> >>> > > >
> > >> >>> > > > Are HLogs generated by Regionservers? Would it alleviate the
> > >> issue
> > >> >>> if
> > >> >>> > we
> > >> >>> > > use
> > >> >>> > > > the first 14 for regionserver, and the rest of 5 for
> > >> zookeeper?(In
> > >> >>> that
> > >> >>> > > > sense, the node running zookeeper quorum won't run
> > regionserver)
> > >> >>> > > >
> > >> >>> > > > I am very appreciated for your comments.
> > >> >>> > > >
> > >> >>> > > > Best,
> > >> >>> > > > zhenyu
> > >> >>> > > >
> > >> >>> > > >
> > >> >>> > > >
> > >> >>> > > > On Wed, Nov 11, 2009 at 2:30 PM, Jean-Daniel Cryans <
> > >> >>> > jdcryans@apache.org
> > >> >>> > > >wrote:
> > >> >>> > > >
> > >> >>> > > >> The problem seems to be that the IO is saturated. When you
> > see
> > >> >>> this:
> > >> >>> > > >>
> > >> >>> > > >> #
> > >> >>> > > >> 2009-11-11 04:28:10,308 WARN
> > >> >>> > > >> org.apache.hadoop.hbase.regionserver.HLog: IPC Server
> handler
> > 9
> > >> on
> > >> >>> > > >> 60021 took 6819ms appending an edit to hlog; editcount=370
> > >> >>> > > >> #
> > >> >>> > > >> 2009-11-11 04:28:10,308 WARN
> > >> >>> > > >> org.apache.hadoop.hbase.regionserver.HLog: IPC Server
> handler
> > 2
> > >> on
> > >> >>> > > >> 60021 took 4412ms appending an edit to hlog; editcount=371
> > >> >>> > > >>
> > >> >>> > > >> It's a sign that HDFS is slow. I guess that the zookeeper
> > quorum
> > >> >>> > > >> members are on those same nodes using the same disks? If
> so,
> > >> >>> there's
> > >> >>> > > >> the problem because Zookeeper needs to be able to commit
> > >> >>> transactions
> > >> >>> > > >> very fast and if your disks are already hogged then they
> have
> > to
> > >> >>> wait
> > >> >>> > > >> and you can get disconnections. Do you still have 19 quorum
> > >> >>> members?
> > >> >>> > > >> How many disks do you have per machine?
> > >> >>> > > >>
> > >> >>> > > >> Thx
> > >> >>> > > >>
> > >> >>> > > >> J-D
> > >> >>> > > >>
> > >> >>> > > >> On Wed, Nov 11, 2009 at 11:22 AM, Zhenyu Zhong <
> > >> >>> > zhongresearch@gmail.com
> > >> >>> > > >
> > >> >>> > > >> wrote:
> > >> >>> > > >> > Please take a look at the following regionserver log.
> > >> >>> > > >> > The error started to come out from 4:24am UTC to 4:29am
> > UTC.
> > >> >>> > > >> >
> > >> >>> > > >> > http://pastebin.com/m3717d064
> > >> >>> > > >> >
> > >> >>> > > >> > Thanks in advance.
> > >> >>> > > >> >
> > >> >>> > > >> > Best,
> > >> >>> > > >> > zhenyu
> > >> >>> > > >> >
> > >> >>> > > >> >
> > >> >>> > > >> > On Wed, Nov 11, 2009 at 2:01 PM, Jean-Daniel Cryans <
> > >> >>> > > jdcryans@apache.org
> > >> >>> > > >> >wrote:
> > >> >>> > > >> >
> > >> >>> > > >> >> Could you paste a bigger log trace (interested to see at
> > >> least
> > >> >>> all
> > >> >>> > > 300
> > >> >>> > > >> >> lines before that) in a pastebin?
> > >> >>> > > >> >>
> > >> >>> > > >> >> Thx,
> > >> >>> > > >> >>
> > >> >>> > > >> >> J-D
> > >> >>> > > >> >>
> > >> >>> > > >> >> On Wed, Nov 11, 2009 at 10:56 AM, Zhenyu Zhong <
> > >> >>> > > zhongresearch@gmail.com
> > >> >>> > > >> >
> > >> >>> > > >> >> wrote:
> > >> >>> > > >> >> > J-D,
> > >> >>> > > >> >> >
> > >> >>> > > >> >> > Thanks for the reply.
> > >> >>> > > >> >> >
> > >> >>> > > >> >> > The problem I have is one or more of the regionservers
> > >> >>> disconnect
> > >> >>> > > from
> > >> >>> > > >> >> the
> > >> >>> > > >> >> > cluster.
> > >> >>> > > >> >> >
> > >> >>> > > >> >> > I checked the resource usage including memory Heap
> usage
> > >> for
> > >> >>> > > >> >> regionserver,
> > >> >>> > > >> >> > and found nothing suspicious. The regionserver heap
> > usage
> > >> is
> > >> >>> way
> > >> >>> > > below
> > >> >>> > > >> >> the
> > >> >>> > > >> >> > maxHeap defined in jvm.
> > >> >>> > > >> >> >
> > >> >>> > > >> >> > So I checked zookeeper log, then I found the following
> > >> >>> > > >> >> > BufferUnderflowException, eventually it leads to
> > >> >>> SocketException:
> > >> >>> > > >> >> Transport
> > >> >>> > > >> >> > endpoint is not connected.
> > >> >>> > > >> >> >
> > >> >>> > > >> >> >
> > >> >>> > > >> >> > I also checked the regionserver log. It looks like the
> > >> >>> > regionserver
> > >> >>> > > >> tried
> > >> >>> > > >> >> to
> > >> >>> > > >> >> > connect to other zookeeper quorum server. It connects
> > >> >>> > successfully,
> > >> >>> > > >> but
> > >> >>> > > >> >> then
> > >> >>> > > >> >> > it complained about SocketException: transport
> endpoint
> > is
> > >> not
> > >> >>> > > >> connected.
> > >> >>> > > >> >> >
> > >> >>> > > >> >> > So both zookeeper log and regionserver log told me
> that
> > the
> > >> >>> > > transport
> > >> >>> > > >> >> > endpoint is not connected. I don't know why.
> > >> >>> > > >> >> >
> > >> >>> > > >> >> > I would be very appreciated if you could point me to
> the
> > >> right
> > >> >>> > > >> direction.
> > >> >>> > > >> >> >
> > >> >>> > > >> >> > Best,
> > >> >>> > > >> >> >
> > >> >>> > > >> >> >
> > >> >>> > > >> >> > Regionserver log:
> > >> >>> > > >> >> > 2009-11-11 04:24:53,718 INFO
> > >> org.apache.zookeeper.ClientCnxn:
> > >> >>> > > >> Attempting
> > >> >>> > > >> >> > connection to server superpyxis0018/
> > 192.168.100.132:2181
> > >> >>> > > >> >> > 2009-11-11 04:24:53,718 INFO
> > >> org.apache.zookeeper.ClientCnxn:
> > >> >>> > > Priming
> > >> >>> > > >> >> > connection to
> java.nio.channels.SocketChannel[connected
> > >> >>> local=/
> > >> >>> > > >> >> > 192.168.100.131:43065 remote=superpyxis0018/
> > >> >>> 192.168.100.132:2181
> > >> >>> > ]
> > >> >>> > > >> >> > 2009-11-11 04:24:53,718 INFO
> > >> org.apache.zookeeper.ClientCnxn:
> > >> >>> > > Server
> > >> >>> > > >> >> > connection successful
> > >> >>> > > >> >> > 2009-11-11 04:24:53,768 INFO
> > >> >>> > > >> >> > org.apache.hadoop.hbase.regionserver.HRegionServer:
> Got
> > >> >>> ZooKeeper
> > >> >>> > > >> event,
> > >> >>> > > >> >> > state: Disconnected, type: None, path: null
> > >> >>> > > >> >> > 2009-11-11 04:24:54,118 INFO
> > >> org.apache.zookeeper.ClientCnxn:
> > >> >>> > > >> Attempting
> > >> >>> > > >> >> > connection to server superpyxis0017/
> > 192.168.100.131:2181
> > >> >>> > > >> >> > 2009-11-11 04:24:54,118 INFO
> > >> org.apache.zookeeper.ClientCnxn:
> > >> >>> > > Priming
> > >> >>> > > >> >> > connection to
> java.nio.channels.SocketChannel[connected
> > >> >>> local=/
> > >> >>> > > >> >> > 192.168.100.131:46903 remote=superpyxis0017/
> > >> >>> 192.168.100.131:2181
> > >> >>> > ]
> > >> >>> > > >> >> > 2009-11-11 04:24:54,118 INFO
> > >> org.apache.zookeeper.ClientCnxn:
> > >> >>> > > Server
> > >> >>> > > >> >> > connection successful
> > >> >>> > > >> >> > 2009-11-11 04:24:54,118 WARN
> > >> org.apache.zookeeper.ClientCnxn:
> > >> >>> > > >> Exception
> > >> >>> > > >> >> > closing session 0x24dfd90c810002 to
> > >> >>> > > >> sun.nio.ch.SelectionKeyImpl@2dd78ccf
> > >> >>> > > >> >> > java.io.IOException: Read error rc = -1
> > >> >>> > > >> java.nio.DirectByteBuffer[pos=0
> > >> >>> > > >> >> > lim=4 cap=4]
> > >> >>> > > >> >> >        at
> > >> >>> > > >> >> >
> > >> >>> > >
> > >> org.apache.zookeeper.ClientCnxn$SendThread.doIO(ClientCnxn.java:701)
> > >> >>> > > >> >> >        at
> > >> >>> > > >> >> >
> > >> >>> >
> > org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:945)
> > >> >>> > > >> >> > 2009-11-11 04:24:54,118 WARN
> > >> org.apache.zookeeper.ClientCnxn:
> > >> >>> > > Ignoring
> > >> >>> > > >> >> > exception during shutdown input
> > >> >>> > > >> >> > java.net.SocketException: Transport endpoint is not
> > >> connected
> > >> >>> > > >> >> >        at sun.nio.ch.SocketChannelImpl.shutdown(Native
> > >> Method)
> > >> >>> > > >> >> >        at
> > >> >>> > > >> >> >
> > >> >>> > >
> > >> sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:640)
> > >> >>> > > >> >> >        at
> > >> >>> > > >>
> > sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:360)
> > >> >>> > > >> >> >        at
> > >> >>> > > >> >> >
> > >> >>> > > >>
> > >> >>> >
> > >>
> org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:999)
> > >> >>> > > >> >> >        at
> > >> >>> > > >> >> >
> > >> >>> >
> > org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:970)
> > >> >>> > > >> >> >
> > >> >>> > > >> >> >
> > >> >>> > > >> >> >
> > >> >>> > > >> >> >
> > >> >>> > > >> >> >
> > >> >>> > > >> >> > On Wed, Nov 11, 2009 at 1:40 PM, Jean-Daniel Cryans <
> > >> >>> > > >> jdcryans@apache.org
> > >> >>> > > >> >> >wrote:
> > >> >>> > > >> >> >
> > >> >>> > > >> >> >> I'm really not sure exactly what the situation is
> with
> > the
> > >> >>> > > >> >> >> java.nio.BufferUnderflowException, but what do you
> mean
> > by
> > >> >>> > > >> >> >> "regionserver disconnection"? Could you give more
> > details?
> > >> >>> > > >> >> >>
> > >> >>> > > >> >> >> Thx,
> > >> >>> > > >> >> >>
> > >> >>> > > >> >> >> J-D
> > >> >>> > > >> >> >>
> > >> >>> > > >> >> >> On Wed, Nov 11, 2009 at 10:34 AM, Zhenyu Zhong <
> > >> >>> > > >> zhongresearch@gmail.com
> > >> >>> > > >> >> >
> > >> >>> > > >> >> >> wrote:
> > >> >>> > > >> >> >> > I searched around and found HBASE-1645 "HBase could
> > be a
> > >> >>> > little
> > >> >>> > > >> more
> > >> >>> > > >> >> >> dainty
> > >> >>> > > >> >> >> > when zk is pulled out from under it"
> > >> >>> > > >> >> >> >
> > >> >>> > > >> >> >> > I am wondering whether my problem is related to
> this
> > >> >>> > HBase-1645.
> > >> >>> > > Or
> > >> >>> > > >> >> >> probably
> > >> >>> > > >> >> >> > has nothing to do with it?
> > >> >>> > > >> >> >> >
> > >> >>> > > >> >> >> > thanks
> > >> >>> > > >> >> >> >
> > >> >>> > > >> >> >> >
> > >> >>> > > >> >> >> > On Wed, Nov 11, 2009 at 12:02 PM, Zhenyu Zhong <
> > >> >>> > > >> >> zhongresearch@gmail.com
> > >> >>> > > >> >> >> >wrote:
> > >> >>> > > >> >> >> >
> > >> >>> > > >> >> >> >> Hi,
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >> >> I have been monitoring the system resources such
> as
> > >> memory
> > >> >>> > Heap
> > >> >>> > > >> usage
> > >> >>> > > >> >> >> for
> > >> >>> > > >> >> >> >> Regionserver, load average, network bandwidth,
> etc.
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >> >> I experienced a disconnection last night. When I
> > >> checked
> > >> >>> the
> > >> >>> > > >> memory
> > >> >>> > > >> >> Heap
> > >> >>> > > >> >> >> >> for Regionserver, it was 2336 which is way below
> the
> > >> max
> > >> >>> Heap
> > >> >>> > > >> 4096. I
> > >> >>> > > >> >> >> don't
> > >> >>> > > >> >> >> >> think it is Regionserver problem. The requests
> that
> > the
> > >> >>> > > >> regionserver
> > >> >>> > > >> >> got
> > >> >>> > > >> >> >> was
> > >> >>> > > >> >> >> >> about 126 which doesn't seem to be high. The load
> > >> average
> > >> >>> is
> > >> >>> > > kind
> > >> >>> > > >> of
> > >> >>> > > >> >> >> high
> > >> >>> > > >> >> >> >> >100. (but I saw disconnections while the load
> > average
> > >> is
> > >> >>> > > around
> > >> >>> > > >> 30).
> > >> >>> > > >> >> >> The
> > >> >>> > > >> >> >> >> bandwidth is not a problem.
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >> >> However, I found error messages from the
> zookeeper.
> > >> Please
> > >> >>> > see
> > >> >>> > > the
> > >> >>> > > >> >> >> >> following error messages. There are some
> > >> >>> > > >> >> >> >> BufferUnderflowException error, IOException
> > error,etc.
> > >> >>> > > >> >> >> >> May I ask what might be the causes that generate
> > these
> > >> >>> error
> > >> >>> > > >> >> messages?
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >> >> Many thanks
> > >> >>> > > >> >> >> >> zhenyu
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 WARN
> > >> >>> > > org.apache.zookeeper.server.Request:
> > >> >>> > > >> >> >> Ignoring
> > >> >>> > > >> >> >> >> exception during toString
> > >> >>> > > >> >> >> >> java.nio.BufferUnderflowException
> > >> >>> > > >> >> >> >>         at
> > >> >>> > java.nio.HeapByteBuffer.get(HeapByteBuffer.java:127)
> > >> >>> > > >> >> >> >>         at
> > java.nio.ByteBuffer.get(ByteBuffer.java:675)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >>
> > >> >>> org.apache.zookeeper.server.Request.toString(Request.java:199)
> > >> >>> > > >> >> >> >>         at
> > java.lang.String.valueOf(String.java:2827)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > java.lang.StringBuilder.append(StringBuilder.java:115)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >>
> > >> >>> > > >> >>
> > >> >>> > > >>
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >>
> >
> org.apache.zookeeper.server.quorum.CommitProcessor.processRequest(CommitProcessor.java:167)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >>
> > >> >>> > > >> >>
> > >> >>> > > >>
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >>
> >
> org.apache.zookeeper.server.quorum.FollowerRequestProcessor.run(FollowerRequestProcessor.java:68)
> > >> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 WARN
> > >> >>> > > >> >> org.apache.zookeeper.server.NIOServerCnxn:
> > >> >>> > > >> >> >> >> Exception causing close of session
> 0x424dfd908c50009
> > >> >>> > > >> >> >> >> due to java.io.IOException: Read error
> > >> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 DEBUG
> > >> >>> > > >> >> org.apache.zookeeper.server.NIOServerCnxn:
> > >> >>> > > >> >> >> >> IOException stack trace
> > >> >>> > > >> >> >> >> java.io.IOException: Read error
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >>
> > >> >>> > >
> > >> org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:372)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >>
> > >> >>> > > >> >>
> > >> >>> > > >>
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >>
> >
> org.apache.zookeeper.server.NIOServerCnxn$Factory.run(NIOServerCnxn.java:221)
> > >> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 DEBUG
> > >> >>> > > >> >> >> >>
> org.apache.zookeeper.server.quorum.CommitProcessor:
> > >> >>> > Processing
> > >> >>> > > >> >> request::
> > >> >>> > > >> >> >> >> sessionid:0x424dfd908c50009 type:setWatches
> > >> >>> > > >> cxid:0xfffffffffffffff8
> > >> >>> > > >> >> >> >> zxid:0xfffffffffffffffe txntype:unknown n/a
> > >> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 WARN
> > >> >>> > > org.apache.zookeeper.server.Request:
> > >> >>> > > >> >> >> Ignoring
> > >> >>> > > >> >> >> >> exception during toString
> > >> >>> > > >> >> >> >> java.nio.BufferUnderflowException
> > >> >>> > > >> >> >> >>         at
> > >> >>> > java.nio.HeapByteBuffer.get(HeapByteBuffer.java:127)
> > >> >>> > > >> >> >> >>         at
> > java.nio.ByteBuffer.get(ByteBuffer.java:675)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >>
> > >> >>> org.apache.zookeeper.server.Request.toString(Request.java:199)
> > >> >>> > > >> >> >> >>         at
> > java.lang.String.valueOf(String.java:2827)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > java.lang.StringBuilder.append(StringBuilder.java:115)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >>
> > >> >>> > > >> >>
> > >> >>> > > >>
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >>
> >
> org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:74)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >>
> > >> >>> > > >> >>
> > >> >>> > > >>
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >>
> >
> org.apache.zookeeper.server.quorum.CommitProcessor.run(CommitProcessor.java:73)
> > >> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 DEBUG
> > >> >>> > > >> >> >> >> org.apache.zookeeper.server.FinalRequestProcessor:
> > >> >>> Processing
> > >> >>> > > >> >> request::
> > >> >>> > > >> >> >> >> sessionid:0x424dfd908c50009 type:setWatches
> > >> >>> > > >> cxid:0xfffffffffffffff8
> > >> >>> > > >> >> >> >> zxid:0xfffffffffffffffe txntype:unknown n/a
> > >> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 WARN
> > >> >>> > > org.apache.zookeeper.server.Request:
> > >> >>> > > >> >> >> Ignoring
> > >> >>> > > >> >> >> >> exception during toString
> > >> >>> > > >> >> >> >> java.nio.BufferUnderflowException
> > >> >>> > > >> >> >> >>         at
> > >> >>> > java.nio.HeapByteBuffer.get(HeapByteBuffer.java:127)
> > >> >>> > > >> >> >> >>         at
> > java.nio.ByteBuffer.get(ByteBuffer.java:675)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >>
> > >> >>> org.apache.zookeeper.server.Request.toString(Request.java:199)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >>
> > >> >>>
> > org.apache.log4j.or.DefaultRenderer.doRender(DefaultRenderer.java:36)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > >
> > org.apache.log4j.or.RendererMap.findAndRender(RendererMap.java:80)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >>
> > >> >>> > > >> >>
> > >> >>> > > >>
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >>
> >
> org.apache.log4j.spi.LoggingEvent.getRenderedMessage(LoggingEvent.java:362)
> > >> >>> > > >> >> >> >> at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >>
> > >> >>> > > >> >>
> > >> >>> > > >>
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >>
> >
> org.apache.log4j.helpers.PatternParser$BasicPatternConverter.convert(PatternParser.java:403)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >>
> > >> >>> > > >> >>
> > >> >>> > > >>
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >>
> >
> org.apache.log4j.helpers.PatternConverter.format(PatternConverter.java:65)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >>
> > org.apache.log4j.PatternLayout.format(PatternLayout.java:502)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > >
> > org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:302)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >>
> > >> >>> > > >> >>
> > >> >>> > > >>
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >>
> >
> org.apache.log4j.DailyRollingFileAppender.subAppend(DailyRollingFileAppender.java:359)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >>
> > >> >>> org.apache.log4j.WriterAppender.append(WriterAppender.java:160)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >>
> > >> >>>
> > org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >>
> > >> >>> > > >> >>
> > >> >>> > > >>
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >>
> >
> org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:66)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> org.apache.log4j.Category.callAppenders(Category.java:206)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > org.apache.log4j.Category.forcedLog(Category.java:391)
> > >> >>> > > >> >> >> >>         at
> > >> >>> org.apache.log4j.Category.debug(Category.java:260)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >>
> > >> >>> > > >> >>
> > >> >>> > > >>
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >>
> >
> org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:147)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >>
> > >> >>> > > >> >>
> > >> >>> > > >>
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >>
> >
> org.apache.zookeeper.server.quorum.CommitProcessor.run(CommitProcessor.java:73)
> > >> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 WARN
> > >> >>> > > org.apache.zookeeper.server.Request:
> > >> >>> > > >> >> >> Ignoring
> > >> >>> > > >> >> >> >> exception during toString
> > >> >>> > > >> >> >> >> sessionid:0x424dfd908c50009 type:setWatches
> > >> >>> > > >> cxid:0xfffffffffffffff8
> > >> >>> > > >> >> >> >> zxid:0xfffffffffffffffe txntype:unknown n/a
> > >> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 INFO
> > >> >>> > > >> >> org.apache.zookeeper.server.NIOServerCnxn:
> > >> >>> > > >> >> >> >> closing session:0x424dfd908c50009 NIOServerCnxn:
> > >> >>> > > >> >> >> >> java.nio.channels.SocketChannel[connected local=/
> > >> >>> > > >> >> 192.168.100.131:2181
> > >> >>> > > >> >> >> remote=/
> > >> >>> > > >> >> >> >> 192.168.100.131:35500]
> > >> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 DEBUG
> > >> >>> > > >> >> org.apache.zookeeper.server.NIOServerCnxn:
> > >> >>> > > >> >> >> >> ignoring exception during input shutdown
> > >> >>> > > >> >> >> >> java.net.SocketException: Transport endpoint is
> not
> > >> >>> connected
> > >> >>> > > >> >> >> >>         at
> > sun.nio.ch.SocketChannelImpl.shutdown(Native
> > >> >>> > Method)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >>
> > >> >>> > >
> > >> sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:640)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >>
> > >> >>> sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:360)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >>
> > >> >>> > >
> > >> >>>
> > org.apache.zookeeper.server.NIOServerCnxn.close(NIOServerCnxn.java:848)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >>
> > >> >>> > >
> > >> org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:498)
> > >> >>> > > >> >> >> >>         at
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >>
> > >> >>> > > >> >>
> > >> >>> > > >>
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >>
> >
> org.apache.zookeeper.server.NIOServerCnxn$Factory.run(NIOServerCnxn.java:221)
> > >> >>> > > >> >> >> >>
> > >> >>> > > >> >> >> >
> > >> >>> > > >> >> >>
> > >> >>> > > >> >> >
> > >> >>> > > >> >>
> > >> >>> > > >> >
> > >> >>> > > >>
> > >> >>> > > >
> > >> >>> > >
> > >> >>> >
> > >> >>>
> > >> >>
> > >> >>
> > >> >
> > >>
> > >
> >
>

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